Well, it's certainly not impossible that he harmed you. And definitely that kind of mindset is going to incline someone toward all sorts of violent acts. The question is whether it was these specific acts, and whether they were directed toward you.
I realize that you are only sixteen, but it would help to speak with a therapist. I know that getting to that point is not easy when you are a minor, but I am sure that your parents are well aware of your brother's issues. You could frame it in terms of seeking help in coping with having such a brother. If that is too much, then ask to see your regular pediatrician. Complain of headaches if you must (I hate the idea of lying in this area, but I understand that you may be in a position where providing the whole truth to your folks will do more harm than good) and ask the doctor for a referral to a mental health specialist. At least to talk should help.
Best of luck to you.